If `alpha cos^ 3 theta + beta cos^4 theta = 16 cos^6 theta + 9 cos^2 theta` is an identity then-

If a cos^ 3 3theta + b cos^4 theta = 16 cos^6 theta + 9 cos^2 theta is an identity then-

4cos6 theta cos4 theta cos2 theta=

4 cos 6 theta cos 4 theta cos 2 theta =

2 cos theta - cos 3 theta - cos 5 theta - 16 cos^(3) theta sin^(2) theta =

alpha cos^(2)3 theta+beta cos^(4)theta=16cos^(6)theta+9cos^(2)theta Find alpha& beta if its a identity

1+cos2 theta+cos4 theta+cos6 theta=

alphacos^2 3theta+betacos^4theta=16cos^6theta+9cos^2theta . Find alpha & beta if its a identity

1+ cos 2 theta + cos 4 theta + cos 6 theta =

Prove the following : cos 3 theta+ cos 5 theta+ cos 7 theta+ cos 9 theta= 4 cos theta cos 2 theta cos 6 theta .